Promax QR-1 Seatpost Clamp - 34.9mm QR Red MPFN-P100005620 2-pc caliper features a forged

2-pc caliper features a forged aluminum body and (4) phenolic pistons that have excellent insulator properties

Breakaway visor function for efficient impact force reduction

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Black or silver anodized finish

Promax QR-1 Seatpost Clamp - 34.9mm QR Red MPFN-P100005620 2-pc caliper features a forgedPromax QR 1 Quick Release Seatpost Clamp 34. 9mm Red. QR 1 seatpost clamps are cold forged and CNC machined from 6061 T6 aluminum alloy. The QR 1 as the name implies has a quick release lever making seat height adjustments a snap. Weighing just 30 grams 1. 1 ounces in the 31. 8 size its as lightweight as it is tough. The head of the lever and the face of the clamp are given a proprietary low friction surface treatment that ensures smooth lever action